Section 7: Torch Maintenance; Introduction; General Torch Maintenance - Thermal Dynamics PAK 200 Operating Manual

7.01 Introduction

This section describes basic maintenance procedures
performable by operating personnel. No other adjust-
ments or repairs are to be attempted by other than properly
personnel.
!
Disconnect primary power at the source before
disassembling the torch or torch leads.
Frequently review the Important Safety Precau-
tions (page 1). Be sure the operator is equipped
with proper gloves, clothing, eye and ear protection.
Make sure no part of the operator's body comes
into contact with the workpiece while the torch is
activated.
Sparks from the cutting process can cause damage
to coated, painted, and other surfaces such as glass,
plastic and metal.
Handle torch leads with care and protect them
from damage.

7.02 General Torch Maintenance

A. Cleaning Torch
Even if precautions are taken to use only clean air with
a torch, eventually the inside of the torch becomes
coated with residue. This buildup can affect the pilot
arc initiation and the overall cut quality of the torch.
Disconnect primary power to the system before
disassembling the torch or torch leads.
DO NOT touch any internal torch parts while
the AC indicator light on the front panel of the
power supply is ON.
Manual 0-5057
SECTION 7:
TORCH MAINTENANCE
WARNING
WARNING
The inside of the torch should be cleaned with electrical
contact cleaner using a cotton swab or soft wet rag.
In severe cases, the torch can be removed from the
leads (refer to Section 5.07, Servicing Machine Torch
Components, or Section 5.06, Servicing Hand Torch
Components) and cleaned more thoroughly by pouring
electrical contact cleaner into the torch and blowing it
through with compressed air.
Dry the torch thoroughly before reinstalling.
B. Checking Center Insulator
The center insulator separates the negative and posi-
tive sections of the torch. If the center insulator does
not provide adequate resistance, current which is
intended for the pilot arc may be dissipated into the
torch head, resulting in torch failure.
Disconnect primary power to the system before
disassembling the torch or torch leads.
DO NOT touch any internal torch parts while
the AC indicator light on the front panel of the
power supply is ON.
1. Remove the shield cup, tip, gas distributor, and
electrode from the torch. Disconnect the torch
leads from the power supply to isolate the torch
from power supply circuits.
2. Using an ohmmeter (set to 10K or higher), check
for continuity between the positive and negative
torch fittings. Infinite resistance (no continuity)
should be found. If continuity is found, refer to
Section 5.08, Torch and Leads Troubleshooting.
7-1
PAK 200
CAUTION
WARNING
TORCH MAINTENANCE